Delta has announced changes to their mileage earning structure today. Not it's not the feared revenue based earning but it makes changes across the Skyteam board.
Effective September 1st the new chart will be in place – that means all flights on or after that day. It would have been better to make changes effective for flights booked after September 1st. Some of the flights you bought may now not earn any miles anymore.
I do like the simple way they present the mileage earning options. It can be hard to determine what booking class you are on and if it will earn miles in what program. Codeshares make it even harder to determine.
Hardest hit seems Korean Airlines which both sees the category bonus and MQM earning abilities cut short.
What other differences did you spot?